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For the reaction
CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics
Problem
For the reaction
C
O
(
g
)
+
1
2
O
2
(
g
)
→
C
O
2
(
g
)
\mathrm{CO(g)+\tfrac{1}{2}O_2(g)\rightarrow CO_2(g)}
CO
(
g
)
+
2
1
O
2
(
g
)
→
C
O
2
(
g
)
, use the following average bond energies in
kcal mol
−
1
\text{kcal mol}^{-1}
kcal mol
−
1
:
C
≡
O
=
256
\mathrm{C\equiv O}=256
C
≡
O
=
256
,
O
=
O
=
119
\mathrm{O=O}=119
O
=
O
=
119
, and
C
=
O
\mathrm{C=O}
C
=
O
in
C
O
2
=
179
\mathrm{CO_2}=179
C
O
2
=
179
. Determine
Δ
H
\Delta H
Δ
H
per mole of
C
O
2
\mathrm{CO_2}
C
O
2
produced, reporting the answer in
kJ mol
−
1
\text{kJ mol}^{-1}
kJ mol
−
1
. Use
1
kcal
=
4.184
kJ
1\,\text{kcal}=4.184\,\text{kJ}
1
kcal
=
4.184
kJ
.
Related theory
Thermodynamics
Types of enthalpy
Enthalpy Changes of Reactions
Bond Enthalpies
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